加速度和速度都是矢量。

Acceleration and velocity are both vectors.

《牛津词典》

那种矢量就叫做”零矢量“。

That vector is called a "null vector".

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那我们怎么得到这单位矢量呢？

Now, how do we get this unit vector?

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它可以被称为多向矢量性时间之门。

It may be termed a time-gate vector.

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我断言，这个位置矢量在平面上。

Well, I claim that the position vector is in the plane.

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现在，这里是，物体的矢量中心。

And this, now, is the position vector of the center of mass.

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首先，为使用矢量图的指针编写代码。

First, code a needle using vector drawing.

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同时也是，矢量相减的原理。

And that brings us to the point of subtraction of vectors.

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速率保持不变，但速度矢量会发生变化。

The speed is not changing, but the velocity vector is changing.

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因此，路径的概念对矢量作图非常重要。

Therefore, a concept of path is fundamental to vector drawings.

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我经历了一个矢量的量变。

I experience a vector quantity.

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我们都见过…这就是矢量。

We all have seen... this is a vector.

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我的力朝这个方向，矢量。

And I applied the torque in this direction, the vector.

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就是我们所说的速度矢量。

OK, that's what we call the velocity vector.

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这就是矢量，这就是矢量的，表示方法。

This is a vector and that will be our representation of vectors.

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还有一个有用的概念就是轨道的单位矢量。

Now, another useful notion is the unit vector to the trajectory.

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一个与半径垂直的矢量。

It's a vector, perpendicular.

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角动量的矢量会怎样呢？

What will the angular momentum vector do?

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因此我们叫它速度矢量。

And so, that's called the velocity vector.

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来看看位置矢量的改变。

And, we look at how the position vector changes.

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记住它，这是个矢量。

Remember this-- this is a vector.

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好，这就是速度矢量。

OK, so that's the velocity vector.

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这就叫做矢量分解。

And we call that "decomposition" of a vector.

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好的，所以让我来做矢量图。

Ok, so let me take the column picture.

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它构成一个矢量。

This makes it a vector.

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如果有两个矢量。

Suppose you have two vectors.

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就是这个矢量。

This is that vector.

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我没写成矢量。

I don't write them down as vectors.

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我没写成矢量。

I don't write them down as vectors.

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